Ham and Alan, thank you very much
I am inclined to agree with Michael, the character that appears numeric 2 may very well be Arabic (I'm definitely not a linguist!) and seems to correspond in degree the the Arabic letter 'ayn'. Possibly the singular letter may be an inventory mark which may support the idea that this was furbished in the Arabian Aden region from British sword components. The diagonal lines at the forte on the blade as well as the cross section seem to correspond to British military blades of the 1790's.
Best regards,
Jim